diff options
Diffstat (limited to 'kernel/delayacct.c')
| -rw-r--r-- | kernel/delayacct.c | 24 |
1 files changed, 4 insertions, 20 deletions
diff --git a/kernel/delayacct.c b/kernel/delayacct.c index f05392d6426..36752f124c6 100644 --- a/kernel/delayacct.c +++ b/kernel/delayacct.c @@ -19,15 +19,15 @@ #include <linux/sysctl.h> #include <linux/delayacct.h> -int delayacct_on __read_mostly; /* Delay accounting turned on/off */ +int delayacct_on __read_mostly = 1; /* Delay accounting turned on/off */ kmem_cache_t *delayacct_cache; -static int __init delayacct_setup_enable(char *str) +static int __init delayacct_setup_disable(char *str) { - delayacct_on = 1; + delayacct_on = 0; return 1; } -__setup("delayacct", delayacct_setup_enable); +__setup("nodelayacct", delayacct_setup_disable); void delayacct_init(void) { @@ -41,24 +41,11 @@ void delayacct_init(void) void __delayacct_tsk_init(struct task_struct *tsk) { - spin_lock_init(&tsk->delays_lock); - /* No need to acquire tsk->delays_lock for allocation here unless - __delayacct_tsk_init called after tsk is attached to tasklist - */ tsk->delays = kmem_cache_zalloc(delayacct_cache, SLAB_KERNEL); if (tsk->delays) spin_lock_init(&tsk->delays->lock); } -void __delayacct_tsk_exit(struct task_struct *tsk) -{ - struct task_delay_info *delays = tsk->delays; - spin_lock(&tsk->delays_lock); - tsk->delays = NULL; - spin_unlock(&tsk->delays_lock); - kmem_cache_free(delayacct_cache, delays); -} - /* * Start accounting for a delay statistic using * its starting timestamp (@start) @@ -118,8 +105,6 @@ int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk) struct timespec ts; unsigned long t1,t2,t3; - spin_lock(&tsk->delays_lock); - /* Though tsk->delays accessed later, early exit avoids * unnecessary returning of other data */ @@ -161,7 +146,6 @@ int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk) spin_unlock(&tsk->delays->lock); done: - spin_unlock(&tsk->delays_lock); return 0; } |